Rudder is an absolute necessity in an engine out. i believe a BA 747 almost clipped a hilltop in Oakland California, because the pilot controlled with all aileron and no rudder. The aircraft couldn't climb with all that aileron.
I believe that the reason for the pilot input this way was that they did not initially recognize a classic engine out, what with all the noise and rocking. The pilot was probably trained for a simple V2 cut without the noise and lurching around that goes with a surging engine.